What was the Castellammarese War?

The American Mafia in the late 1920s was not one organisation. It was a collection of competing factions, each controlled by Sicilian immigrants who had brought the old-world traditions of the Mafia with them from their home towns. These men — known disparagingly as the Mustache Petes — ran their operations with brutal discipline, resisted cooperation with non-Sicilian criminals, and spent enormous energy fighting each other for dominance.

By 1929 the conflict had narrowed to two dominant figures: Joe Masseria, who had declared himself Boss of Bosses of the entire American Mafia, and Salvatore Maranzano, a deeply ambitious Sicilian who had arrived in the United States in the mid-1920s and rapidly built a powerful faction. The war between them would last two years, claim dozens of lives, and ultimately produce something neither man intended — a completely restructured American underworld that swept away everything they stood for.

The Origins of the War

Joe Masseria had been consolidating power in New York since the early 1920s, systematically eliminating rivals and demanding tribute from every criminal organisation operating in his territory. By 1928 he had effectively crowned himself Boss of Bosses — capo di tutti capi — a title that other bosses resented but feared to challenge.

Salvatore Maranzano arrived from Castellammare del Golfo, Sicily with different ambitions and a different approach. Where Masseria was crude and acquisitive, Maranzano was educated, strategic, and deeply steeped in Sicilian Mafia tradition. He had studied Julius Caesar and modelled his own strategic thinking on the Roman general. He quickly gathered around him a faction drawn heavily from fellow immigrants from Castellammare del Golfo — hence the war’s name — including a young Joe Bonanno, who would go on to found one of New York’s Five Families.

Tensions between the two factions had been building through 1928. The trigger came in late 1929 when Masseria ordered the murder of several associates connected to the Castellammarese faction. Maranzano responded in kind. The war had begun.

The War Itself — 1929 to 1931

The Castellammarese War was fought primarily in New York but had reverberations across the country. Both sides had allies in other cities — Maranzano could call on support from Buffalo’s Stefano Magaddino and other bosses who resented Masseria’s claims to supremacy. Masseria had the numerical advantage in New York itself.

The conflict was grinding and expensive. Dozens of men were killed on both sides. Street-level operations were disrupted as manpower was diverted to the war effort. The financial cost was enormous. By 1930 Masseria was losing — his allies were defecting, his treasury was depleted, and his most capable lieutenant, Lucky Luciano, had begun secretly negotiating with the enemy.

Luciano’s calculation was cold and rational. He could see that Masseria was going to lose. More importantly, he could see that whoever won the war was going to face the same structural problems that had caused it in the first place — an American Mafia run by old-world Sicilians using methods unsuited to the realities of American criminal enterprise. Luciano had a different vision entirely.

The Death of Joe Masseria

Luciano’s deal with Maranzano was simple: he would deliver Masseria in exchange for being named the number two man in the restructured organisation. Maranzano agreed.

On April 15, 1931, Luciano invited Masseria to lunch at Nuova Villa Tammaro restaurant on Coney Island. They ate for two hours and played cards. Then Luciano excused himself to use the bathroom. Within moments four gunmen — Bugsy Siegel, Joe Adonis, Vito Genovese and Albert Anastasia — entered and shot Masseria multiple times. He died face down on the card table, the ace of spades allegedly found in his dead hand.

The Castellammarese War was over. Maranzano had won. He immediately called a meeting of all the major bosses in the country and declared himself Boss of Bosses. He reorganised the New York families into a structure of five distinct organisations — the template that still exists today — and assigned territories and hierarchies. He also drew up a list of men he intended to have killed, including Luciano, Genovese, and several others he considered threats to his authority.

The Death of Salvatore Maranzano

Luciano learned about the death list. He moved faster than Maranzano expected.

On September 10, 1931, four men arrived at Maranzano’s Park Avenue office posing as IRS agents. His guards stood down. The men were not IRS agents — they were sent by Luciano. Maranzano was stabbed and shot multiple times and died on the floor of his own office. On the same evening, in what became known as the Night of the Sicilian Vespers, Luciano’s allies eliminated dozens of old-guard Mafia bosses across the country, clearing the way for a new generation of American-born leadership.

The Mustache Pete era was over.

The Aftermath — Luciano Creates the Commission

With both Masseria and Maranzano dead, Luciano was the most powerful figure in American organised crime. He used that position not to declare himself Boss of Bosses — he abolished the title entirely — but to create something fundamentally different: the Commission.

The Commission was a governing body consisting of the bosses of the major American crime families, each with equal standing. It would resolve disputes between families, authorise major decisions including the killing of bosses, and provide the organisational structure that would govern organised crime in America for the next sixty years. Luciano’s insight was that the title of Boss of Bosses was inherently destabilising — it created a target, invited challenges, and produced exactly the kind of war he had just ended. A commission of equals was more durable.

The five New York families established in the aftermath of the Castellammarese War — the Gambino, Genovese, Lucchese, Colombo and Bonanno families — remain the defining organisations of American organised crime to this day.

Frequently Asked Questions — The Castellammarese War

What was the Castellammarese War?

The Castellammarese War was a power struggle fought between 1929 and 1931 between Joe Masseria’s faction and the Castellammarese faction led by Salvatore Maranzano. Both leaders were killed by Lucky Luciano, who used the power vacuum to establish the Commission and create the modern American Mafia.

Who won the Castellammarese War?

Neither Masseria nor Maranzano won. Both were killed on Luciano’s orders. The true winner was Lucky Luciano, who emerged from the conflict as the most powerful figure in American organised crime and used that position to restructure the entire underworld.

Why is it called the Castellammarese War?

The war is named after Castellammare del Golfo, a town in Sicily from which Maranzano and many of his allies had emigrated. The Castellammarese faction became identified with their Sicilian hometown as the conflict developed.

What happened after the Castellammarese War?

Lucky Luciano established the Commission — a governing body of equal bosses — and reorganised New York’s criminal organisations into the five-family structure still in place today. He abolished the title of Boss of Bosses and created rules designed to prevent future wars of this scale.

Who were the Mustache Petes?

The Mustache Petes were old-guard Sicilian bosses who ran American organised crime using traditional old-world methods. Both Masseria and Maranzano were Mustache Petes. Luciano and his generation deliberately replaced them with a more modern, businesslike approach that opened the Mafia to non-Sicilian partners and focused on profit over tradition.